The iOS 8 update last year introduced the ability for third-party apps to extend their apps to share sheets in other apps just like Messages, Mail, Facebook, and other apps. Pinterest was ready on day one with an iOS app extension in the form of a Pin button that allowed you to “pin” content from Safari to your account.
Today its introducing an enhanced version of that Pin button just as functional as the web version with the ability to “edit descriptions of Pins, create new boards and choose from multiple images in a new grid format.” This should make it easier to save content for viewing later, tagging it with a proper description, and putting in somewhere where you can find it safely later when using the service.
You can download the latest version of Pinterest with the enhanced Pin button share extension for free from the App Store, and Pinterest has created a helpful image that shows how to enable any supported extension on iOS 8 for iPhone, iPad, or iPod touch: